25613557 has 4 divisors (see below), whose sum is σ = 25728640. Its totient is φ = 25498476.

The previous prime is 25613531. The next prime is 25613569. The reversal of 25613557 is 75531652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25613557 - 2⁷ = 25613429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25613507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57207 + ... + 57652.

It is an arithmetic number, because the mean of its divisors is an integer number (6432160).

Almost surely, 2^25613557 is an apocalyptic number.

It is an amenable number.

25613557 is a deficient number, since it is larger than the sum of its proper divisors (115083).

25613557 is a wasteful number, since it uses less digits than its factorization.

25613557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115082.

The product of its digits is 31500, while the sum is 34.

The square root of 25613557 is about 5060.9837976425. The cubic root of 25613557 is about 294.7745361425.

The spelling of 25613557 in words is "twenty-five million, six hundred thirteen thousand, five hundred fifty-seven".